21554202342 has 32 divisors (see below), whose sum is σ = 43302104064. Its totient is φ = 7152494400.

The previous prime is 21554202337. The next prime is 21554202347. The reversal of 21554202342 is 24320245512.

It is an interprime number because it is at equal distance from previous prime (21554202337) and next prime (21554202347).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554202347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2348242 + ... + 2357402.

It is an arithmetic number, because the mean of its divisors is an integer number (1353190752).

Almost surely, 2^21554202342 is an apocalyptic number.

21554202342 is an abundant number, since it is smaller than the sum of its proper divisors (21747901722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21554202342 is a wasteful number, since it uses less digits than its factorization.

21554202342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10884.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21554202342 its reverse (24320245512), we get a palindrome (45874447854).

The spelling of 21554202342 in words is "twenty-one billion, five hundred fifty-four million, two hundred two thousand, three hundred forty-two".